Hacking cameras
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Conundrum
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Thu Sept 24 2015, 08:18AM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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Hi all.
After my recent success with the radiation detector based on a mono CMOS camera, I am now experimenting with colour CMOS units. As expected the ones using the OV7000/7500 using a 17.734451 MHz crystal do seem to work down to 4.194 MHz and in the process draw a lot less power (23.9mA versus 28mA @ 5V in) with a sensible load resistor of 1.5K
The problem now is to convert the signal back into useful video probably using some sort of frame buffer. So far my plan is to modify an LM1881 by changing the C1 and R1 values to mirror the frequency used; 1/4 would be 4.43 MHz which is a common enough value used in VCRs.
The end result is an SSTV-via-bluetooth setup built into a surplus CCTV camera housing that uses the microphone input on common BT headsets and would also be compatible with common IR receivers at 50 kHz for long distance use. It could also incoroporate Radu Motisan's uRADMonitor as the data could be processed continuously and tagged onto the end of the 73 second burst as an additional line or 5 of video data for the purposes of correlating lightning strikes with TGFs, roughly once every ten minutes.
Anyone want to lend a hand?
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